D.C. Mun. Regs. tit. 15, r. 15-312
A Utility shall make, at minimum, two (2) attempts to contact the Customer prior to Disconnection as specified in this section.
At least two (2) Days before the date set for Disconnection of service, a Utility shall make reasonable efforts to contact the Customer, by telephone, in person or other technological means, to advise of the pending action and what steps must be taken to avoid Disconnection.
Immediately preceding the physical Disconnection of natural gas or electric service, the representative of the Utility designated to perform that function shall make a reasonable effort to identify himself or herself to the Customer or other responsible person then on the premises and announce the purpose of his or her presence; a telephone Utility shall make a second attempt to contact the customer.
If contact has not been made as provided in § 312.2 and the Customer or other responsible Person is not on the premises, Disconnection of natural gas or electric service shall not occur. The field service representative shall leave a notice reasonably calculated to be seen by the Person residing in the house in the same manner as the notice required by § 314, indicating that service may be disconnected as soon as the next Business Day unless outstanding Bills are paid.
The Utility shall not deliver more than two (2) consecutive notices of Disconnection for past due Bills without attempting contact with the Customer as required by subsections 312.1 and 312.2.
D.C. Mun. Regs. tit. 15, r. 15-312